Express the desired volume in liters.

1L

250 mL X --------= 0.250 L

1000 mL

Concentration is an expression of the relative amounts of solute and solvent

present, a ratio. Express the equivalents per liter and simplify the expression.

2.951 Eq

----------= 11.8 Eq/L

0.250 L

d. **Example**. What is the maximum volume of Na2CO3 solution that can be

prepared from 106.0 grams of Na2CO3 if the desired concentration of solution is 0.500

Eq/L?

Solution. Read the problem carefully and determine the desired quantity.

Volume in liters.

Determine the GEW of the compound.

Na2CO3

Na 23.0 X 2 = 46.0

C 12.0 X 1 = 12.0

O 16.0 X 3 = + 48.0

106.0 g/mol

106.0 g

mol

-------- X -------- = 53.00 g/Eq

mol

2 Eq

Calculate the grams per liter by multiplying the equivalent per liter

concentration times the grams per equivalent.

0.500 Eq

53.00 g

----------X --------= 26.5 g/L

L

Eq

MD0837

4-7

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